Thanks to all who responded.
Special thanks to Godfrey for the link to the paper. >From that document, I learned an interesting thing related to the exposure at high magnifications (p13 of the PDF, p.12 of the paper). I've known that fact experimentally, but never thought about the exact formalism behind it. Igor -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
